From that chart VN30 goes all time high since January therefore this time to go down. Vietnam is popular contry to longterm investing in Southeast asia because of many factors such as the number of new gen population, GDP growth rate, environment, the rapid of growth consumtion. However, as you see VN30 Chart and RSI indicator interaction show Bearish divergent...
From the chart, you can see the trendline and resistance line of VN30 which seems to go downtrend. However, It depends on more fundamental factors: economics policy, company's problems, worlds economics trend, which stay for short time.